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Kill weeds with boiling water.

All you need is tap water that's piping hot to kill weeds in the cracks of your sidewalks and driveway. Pro tip: add a tablespoon of salt to make it even more effective.

Sleep on your back.

This position divides your body weight more evenly, meaning less pressure on your spine. You'll also avoid getting unwanted sleep lines (a.k.a. wrinkles!) on your face.

Vinegar keeps a boiling egg intact.

Anybody who eats boiled eggs knows the frustration of having one crack. Throwing a little vinegar into the boiling water will keep the egg whites from seeping out. The vinegar also eases the peeling process when you're ready to eat.